第82節:Java中的學生管理系統

摘要： 標題圖 第82節:Java中的學生管理系統 學生管理系統的刪除功能 刪除，點選超連結，點選彈出對話方塊式是否進行刪除，如果確定，就刪除，超連結執行的是js方法，在js裡訪問，跳轉servlet,,servlet中呼叫dao方法。 <...

第82節:Java中的學生管理系統

學生管理系統的刪除功能

刪除，點選超連結，點選彈出對話方塊式是否進行刪除，如果確定，就刪除，超連結執行的是js方法，在js裡訪問，跳轉servlet,,servlet中呼叫dao方法。

<a href="#" onclick="doDelete(${stu.sid})">刪除</a>

<script type="text/javascript">

function doDelete(sid) {
// 彈出對話方塊，點選確定，請求Servlet
var flag = confirm("是否確定刪除?");
if(flag){
//訪問servlet
//window.location.href="DeleteServlet?sid="+sid;
location.href="DeleteServlet?sid="+sid;
}
}
</script>

package com.dashucoding.servlet;

import java.io.IOException;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.dashucoding.service.StudentService;
import com.dashucoding.service.impl.StudentServiceImpl;

/**
 * 用於處理刪除學生
 */
public class DeleteServlet extends HttpServlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
int sid = Integer.parseInt(request.getParameter("sid"));
// System.out.println("sid="+sid);
// 執行刪除
StudentService service = new StudentServiceImpl();
service.delete(sid);
// 跳轉到列表頁
request.getRequestDispatcher("StudentListServlet").forward(request, response);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}

}

package com.dashucoding.service.impl;

import java.sql.SQLException;
import java.util.List;

import com.dashucoding.dao.StudentDao;
import com.dashucoding.dao.impl.StudentDaoImpl;
import com.dashucoding.domain.Student;
import com.dashucoding.service.StudentService;
/*
 * 這是學生業務實現
 * */
public class StudentServiceImpl implements StudentService{

@Override
public List<Student> findAll() throws SQLException {
StudentDao dao = new StudentDaoImpl();
return dao.findAll();
}

@Override
public void insert(Student student) throws SQLException {
// TODO Auto-generated method stub
StudentDao dao = new StudentDaoImpl();
dao.insert(student);
}

@Override
public void delete(int sid) throws SQLException {
// TODO Auto-generated method stub
StudentDao dao = new StudentDaoImpl();
dao.delete(sid);
}


}

package com.dashucoding.dao;

import java.sql.SQLException;
import java.util.List;

import com.dashucoding.domain.Student;

/*
 * 這是針對學生表的資料訪問
 * 
 * */
public interface StudentDao {

/*
* 查詢所有學生 list<Student>
*/
List<Student> findAll() throws SQLException;

void insert(Student student) throws SQLException;

// sid根據id刪除學生
void delete(int sid) throws SQLException;
}

package com.dashucoding.dao.impl;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import com.dashucoding.dao.StudentDao;
import com.dashucoding.domain.Student;
import com.dashucoding.util.JDBCUtil02;

/*
 *這是StudentDao的實現,針對前面定義的規範,做出具體的實現
 * */
public class StudentDaoImpl implements StudentDao {
/*
* 查詢所有學生
*/
@Override
public List<Student> findAll() throws SQLException {
QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource());
return runner.query("select * from stu", new BeanListHandler<Student>(Student.class));
}

@Override
public void insert(Student student) throws SQLException {
// TODO Auto-generated method stub
QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource());
runner.update("insert into stu values(null, ?,?,?,?,?,?)", 
student.getSname(), 
student.getGender(),
student.getPhone(), 
student.getBirthday(), 
student.getHobby(), 
student.getInfo()
);
}

@Override
public void delete(int sid) throws SQLException {
// TODO Auto-generated method stub

QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource());
runner.update("delete from stu where sid=?", sid);

}

}

學生管理系統更新

fn:contains()函式

fn:contain()函式用於確定一個字串是否包含指定的子串，函式的語法格式如下:

<c:if test="${fn:contains()"></c:if>

fn:contains
Tests if an input string contains the specified substring.

更新，點選列表上的按鈕進行更新，跳轉EditServlet，根據id查詢這個學生的所有資訊，跳轉到更新的頁面，顯示在瀏覽器，修改後提交到UpdateServlet，提交資料要帶id，獲取資料，呼叫service和呼叫dao。

程式碼案例：

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>

 <%@ taglib prefix="c"uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>學生列表頁面</title>

<script type="text/javascript">

function doDelete(sid) {
// 彈出對話方塊，點選確定，請求Servlet
var flag = confirm("是否確定刪除?");
if(flag){
//訪問servlet
//window.location.href="DeleteServlet?sid="+sid;
location.href="DeleteServlet?sid="+sid;
}
}
</script>

</head>
<body>
<form action="SearchStudentServlet" method="post">
<table border="1" width="700">

<tr >
<td colspan="8">

按姓名查詢:<input type="text" name="sname"/>

按性別查詢:<select name="sgender">
<option value="">--請選擇--
<option value="男">男
<option value="女">女
</select>

<input type="submit" value="查詢">

<a href="add.jsp">新增</a>
</td>
</tr>

<tr align="center">
<td>編號</td>
<td>姓名</td>
<td>性別</td>
<td>電話</td>
<td>生日</td>
<td>愛好</td>
<td>簡介</td>
<td>操作</td>
</tr>

<c:forEach items="${list }" var="stu">
<tr align="center">
<td>${stu.sid }</td>
<td>${stu.sname }</td>
<td>${stu.gender }</td>
<td>${stu.phone }</td>
<td>${stu.birthday }</td>
<td>${stu.hobby }</td>
<td>${stu.info }</td>
<td><a href="EditServlet?sid=${stu.sid }">更新</a><a href="#" onclick="doDelete(${stu.sid})">刪除</a></td>
</tr>
</c:forEach>
</table>
</form>
</body>
</html>

package com.dashucoding.servlet;

import java.io.IOException;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.dashucoding.domain.Student;
import com.dashucoding.service.StudentService;
import com.dashucoding.service.impl.StudentServiceImpl;

/**
 * 處理單個學生的更新，查詢學生的資訊，跳轉到更新的頁面
 */
public class EditServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
// 接收id
int sid = Integer.parseInt(request.getParameter("sid"));
// 查詢學生資料
StudentService service = new StudentServiceImpl();
Student stu = service.findStudentById(sid);

// 顯示資料
// 儲存資料
request.setAttribute("stu", stu);
// 跳轉
request.getRequestDispatcher("edit.jsp").forward(request, response);

} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
*response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}

package com.dashucoding.dao;

import java.sql.SQLException;
import java.util.List;

import com.dashucoding.domain.Student;

/*
 * 這是針對學生表的資料訪問
 * 
 * */
public interface StudentDao {

/*
* 查詢所有學生 list<Student>
*/
List<Student> findAll() throws SQLException;

void insert(Student student) throws SQLException;

// sid根據id刪除學生
void delete(int sid) throws SQLException;

// 根據id查詢單個學生物件
Student findStudentById(int sid) throws SQLException;

// 更新學生資訊
void update(Student student) throws SQLException;
}

package com.dashucoding.dao.impl;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import com.dashucoding.dao.StudentDao;
import com.dashucoding.domain.Student;
import com.dashucoding.util.JDBCUtil02;

/*
 *這是StudentDao的實現,針對前面定義的規範,做出具體的實現
 * */
public class StudentDaoImpl implements StudentDao {
/*
* 查詢所有學生
*/
@Override
public List<Student> findAll() throws SQLException {
QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource());
return runner.query("select * from stu", new BeanListHandler<Student>(Student.class));
}

@Override
public void insert(Student student) throws SQLException {
// TODO Auto-generated method stub
QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource());
runner.update("insert into stu values(null, ?,?,?,?,?,?)", 
student.getSname(), 
student.getGender(),
student.getPhone(), 
student.getBirthday(), 
student.getHobby(), 
student.getInfo()
);
}

@Override
public void delete(int sid) throws SQLException {
// TODO Auto-generated method stub

QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource());
runner.update("delete from stu where sid=?", sid);

}

@Override
public Student findStudentById(int sid) throws SQLException {
// TODO Auto-generated method stub
QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource());

return runner.query("select * from stu where sid = ?", new BeanHandler<Student>(Student.class), sid);
}

@Override
public void update(Student student) throws SQLException {
// TODO Auto-generated method stub
QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource());
runner.update("update stu set sname=?, gender=?, phone=?, birthday=?, hobby=?, info=? where sid=?",
student.getSname(), 
student.getGender(),
student.getPhone(), 
student.getBirthday(), 
student.getHobby(), 
student.getInfo(),
student.getSid());
}

}

package com.dashucoding.service;

import java.sql.SQLException;
import java.util.List;

import com.dashucoding.domain.Student;

/*
 * 這是學生的業務處理規範
 * */
public interface StudentService {

/*
* 查詢所有學生 list<Student>
*/
List<Student> findAll() throws SQLException;

void insert(Student student) throws SQLException;

// sid根據id刪除學生
void delete(int sid) throws SQLException;

// 根據id查詢單個學生物件
Student findStudentById(int sid) throws SQLException;

// 更新學生資訊
void update(Student student) throws SQLException;
}

package com.dashucoding.service.impl;

import java.sql.SQLException;
import java.util.List;

import com.dashucoding.dao.StudentDao;
import com.dashucoding.dao.impl.StudentDaoImpl;
import com.dashucoding.domain.Student;
import com.dashucoding.service.StudentService;

/*
 * 這是學生業務實現
 * */
public class StudentServiceImpl implements StudentService {

@Override
public List<Student> findAll() throws SQLException {
StudentDao dao = new StudentDaoImpl();
return dao.findAll();
}

@Override
public void insert(Student student) throws SQLException {
// TODO Auto-generated method stub
StudentDao dao = new StudentDaoImpl();
dao.insert(student);
}

@Override
public void delete(int sid) throws SQLException {
// TODO Auto-generated method stub
StudentDao dao = new StudentDaoImpl();
dao.delete(sid);
}

@Override
public Student findStudentById(int sid) throws SQLException {
// TODO Auto-generated method stub
StudentDao dao = new StudentDaoImpl();
return dao.findStudentById(sid);
}

@Override
public void update(Student student) throws SQLException {
// TODO Auto-generated method stub
StudentDao dao = new StudentDaoImpl();
dao.update(student);
}

}

package com.dashucoding.servlet;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.dashucoding.domain.Student;
import com.dashucoding.service.StudentService;
import com.dashucoding.service.impl.StudentServiceImpl;

/**
 * Servlet implementation class UpdateServlet
 */
public class UpdateServlet extends HttpServlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
try {
// 1. 獲取客戶端提交上來的資料
int sid = Integer.parseInt(request.getParameter("sid"));
String sname = request.getParameter("sname");
String gender = request.getParameter("gender");
String phone = request.getParameter("phone");
String birthday = request.getParameter("birthday"); 
String info = request.getParameter("info");
// String hobby = request.getParameter("hobby");
String[] h = request.getParameterValues("hobby");

String hobby = Arrays.toString(h);
hobby = hobby.substring(1, hobby.length() - 1);
// 2. 新增到資料庫

Date date = new SimpleDateFormat("yyyy-MM-dd").parse(birthday);
Student student = new Student(sid, sname, gender, phone, hobby, info, date);

// 2. 更新資料庫資料
StudentService service = new StudentServiceImpl();
service.update(student);

// 3. 跳轉介面
request.getRequestDispatcher("StudentListServlet").forward(request, response);
} catch (Exception e) {
e.printStackTrace();
}
}

protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}

package com.dashucoding.servlet;

import java.io.IOException;
import java.sql.SQLException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.dashucoding.dao.StudentDao;
import com.dashucoding.dao.impl.StudentDaoImpl;
import com.dashucoding.domain.Student;
import com.dashucoding.service.StudentService;
import com.dashucoding.service.impl.StudentServiceImpl;

public class StudentListServlet extends HttpServlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
// 查詢所有的學生
StudentService service = new StudentServiceImpl();
List<Student> list = service.findAll();
// 把資料儲存到作用域中
request.setAttribute("list", list);

// 跳轉頁面
request.getRequestDispatcher("list.jsp").forward(request,response);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}

}

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>

 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
 <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>更新學生頁面</title>

</head>


<body>

<h3>更新學生頁面</h3>

<form method="post" action="UpdateServlet">
<input type="hidden" name="sid" value="${stu.sid }">
<table border="1" width="600">
<tr>
<td>姓名</td>
<td><input type="text" name="sname" value="${stu.sname }"></td>
</tr>
<tr>
<td>性別</td>
<td>
<input type="radio" name="gender" value="男" <c:if test="${stu.gender == '男'}">checked</c:if>>男
<input type="radio" name="gender" value="女" <c:if test="${stu.gender == '女'}">checked</c:if>>女
</td>
</tr>
<tr>
<td>電話</td>
<td><input type="text" name="phone" value="${stu.phone }"></td>
</tr>
<tr>
<td>生日</td>
<td><input type="text" name="birthday" value="${stu.birthday }"></td>
</tr>
<tr>
<td>愛好</td>


<td>
<input type="checkbox" name="hobby" value="游泳" <c:if test="${fn:contains(stu.hobby,'游泳') }">checked</c:if>>游泳
<input type="checkbox" name="hobby" value="籃球" <c:if test="${fn:contains(stu.hobby,'籃球') }">checked</c:if>>籃球
<input type="checkbox" name="hobby" value="足球" <c:if test="${fn:contains(stu.hobby,'足球') }">checked</c:if>>足球
<input type="checkbox" name="hobby" value="看書" <c:if test="${fn:contains(stu.hobby,'看書') }">checked</c:if>>看書
<input type="checkbox" name="hobby" value="寫字" <c:if test="${fn:contains(stu.hobby,'寫字') }">checked</c:if>>寫字

</td>
</tr>
<tr>
<td>簡介</td>
<td><textarea name="info" rows="3" cols="20">${stu.info }</textarea></td>
</tr>
<tr>
<td colspan="2"> <input type="submit" value="更新"> </td>
</tr>
</table>
</form>
</body>
</html>

進行模糊查詢

查詢結果

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>

 <%@ taglib prefix="c"uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>學生列表頁面</title>

<script type="text/javascript">

function doDelete(sid) {
// 彈出對話方塊，點選確定，請求Servlet
var flag = confirm("是否確定刪除?");
if(flag){
//訪問servlet
//window.location.href="DeleteServlet?sid="+sid;
location.href="DeleteServlet?sid="+sid;
}
}
</script>

</head>
<body>
<form action="SearchStudentServlet" method="post">
<table border="1" width="700">

<tr >
<td colspan="8">

按姓名查詢:<input type="text" name="sname"/>

按性別查詢:<select name="sgender">
<option value="">--請選擇--
<option value="男">男
<option value="女">女
</select>

<input type="submit" value="查詢">

<a href="add.jsp">新增</a>
</td>
</tr>

<tr align="center">
<td>編號</td>
<td>姓名</td>
<td>性別</td>
<td>電話</td>
<td>生日</td>
<td>愛好</td>
<td>簡介</td>
<td>操作</td>
</tr>

<c:forEach items="${list }" var="stu">
<tr align="center">
<td>${stu.sid }</td>
<td>${stu.sname }</td>
<td>${stu.gender }</td>
<td>${stu.phone }</td>
<td>${stu.birthday }</td>
<td>${stu.hobby }</td>
<td>${stu.info }</td>
<td><a href="EditServlet?sid=${stu.sid }">更新</a><a href="#" onclick="doDelete(${stu.sid})">刪除</a></td>
</tr>
</c:forEach>
</table>
</form>
</body>
</html>

package com.dashucoding.util;

public class TextUtils {

/**
* 判斷某一個字串是否為空。
* 
* @param s
* @return
*/
public static boolean isEmpty(CharSequence s) {
return s == null || s.length() == 0;
}
}

package com.dashucoding.dao;

import java.sql.SQLException;
import java.util.List;

import com.dashucoding.domain.Student;

/*
 * 這是針對學生表的資料訪問
 * 
 * */
public interface StudentDao {

// 根據姓名或性別，查詢
List<Student> searchStudent(String sname, String sgender) throws SQLException;

/*
* 查詢所有學生 list<Student>
*/
List<Student> findAll() throws SQLException;

void insert(Student student) throws SQLException;

// sid根據id刪除學生
void delete(int sid) throws SQLException;

// 根據id查詢單個學生物件
Student findStudentById(int sid) throws SQLException;

// 更新學生資訊
void update(Student student) throws SQLException;
}

package com.dashucoding.dao.impl;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import com.dashucoding.dao.StudentDao;
import com.dashucoding.domain.Student;
import com.dashucoding.util.JDBCUtil02;
import com.dashucoding.util.TextUtils;

/*
 *這是StudentDao的實現,針對前面定義的規範,做出具體的實現
 * */
public class StudentDaoImpl implements StudentDao {
/*
* 查詢所有學生
*/
@Override
public List<Student> findAll() throws SQLException {
QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource());
return runner.query("select * from stu", new BeanListHandler<Student>(Student.class));
}

@Override
public void insert(Student student) throws SQLException {
// TODO Auto-generated method stub
QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource());
runner.update("insert into stu values(null, ?,?,?,?,?,?)", 
student.getSname(), 
student.getGender(),
student.getPhone(), 
student.getBirthday(), 
student.getHobby(), 
student.getInfo()
);
}

@Override
public void delete(int sid) throws SQLException {
// TODO Auto-generated method stub

QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource());
runner.update("delete from stu where sid=?", sid);

}

@Override
public Student findStudentById(int sid) throws SQLException {
// TODO Auto-generated method stub
QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource());

return runner.query("select * from stu where sid = ?", new BeanHandler<Student>(Student.class), sid);
}

@Override
public void update(Student student) throws SQLException {
// TODO Auto-generated method stub
QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource());
runner.update("update stu set sname=?, gender=?, phone=?, birthday=?, hobby=?, info=? where sid=?",
student.getSname(), 
student.getGender(),
student.getPhone(), 
student.getBirthday(), 
student.getHobby(), 
student.getInfo(),
student.getSid());
}

// 模糊查詢
@Override
public List<Student> searchStudent(String sname, String sgender) throws SQLException {
// TODO Auto-generated method stub

/*System.out.println(sname + sgender);*/

QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource());

/*
* String sql = "select * from stu where sname=? or sgender=?";
* select * from stu where sname like ?;
* select * from stu where gender = ?;
* select * from stu where sname like ? and gender = ?;
* 如果兩個都沒有就查詢所有
* sql = "select * from stu"
* if(姓名){
*sql = sql + "where sname like ?";
* }
* if(性別){
*sql = sql + "where gender = ?";
* }
* 
* String sql = "select * from stu where 1=1";
* if(姓名){
*sql = sql + " and sname like ? ";
* }
* if(性別){
*sql = sql + " and gender = ? ";
* }
* */

String sql = "select * from stu where 1=1";

List<String> list = new ArrayList<String>();

if(!TextUtils.isEmpty(sname)) {
sql = sql + " and sname like ? ";
list.add("%"+sname+"%");
}

if(!TextUtils.isEmpty(sgender)) {
sql = sql + " and gender = ? ";
list.add(sgender);
}
/*list.toArray()*/

return runner.query(sql, new BeanListHandler<Student>(Student.class),list.toArray());

}

}

package com.dashucoding.service;

import java.sql.SQLException;
import java.util.List;

import com.dashucoding.domain.Student;

/*
 * 這是學生的業務處理規範
 * */
public interface StudentService {
// 根據姓名或性別，查詢
List<Student> searchStudent(String sname, String sgender) throws SQLException;

/*
* 查詢所有學生 list<Student>
*/
List<Student> findAll() throws SQLException;

void insert(Student student) throws SQLException;

// sid根據id刪除學生
void delete(int sid) throws SQLException;

// 根據id查詢單個學生物件
Student findStudentById(int sid) throws SQLException;

// 更新學生資訊
void update(Student student) throws SQLException;
}

package com.dashucoding.service.impl;

import java.sql.SQLException;
import java.util.List;

import com.dashucoding.dao.StudentDao;
import com.dashucoding.dao.impl.StudentDaoImpl;
import com.dashucoding.domain.Student;
import com.dashucoding.service.StudentService;

/*
 * 這是學生業務實現
 * */
public class StudentServiceImpl implements StudentService {

@Override
public List<Student> findAll() throws SQLException {
StudentDao dao = new StudentDaoImpl();
return dao.findAll();
}

@Override
public void insert(Student student) throws SQLException {
// TODO Auto-generated method stub
StudentDao dao = new StudentDaoImpl();
dao.insert(student);
}

@Override
public void delete(int sid) throws SQLException {
// TODO Auto-generated method stub
StudentDao dao = new StudentDaoImpl();
dao.delete(sid);
}

@Override
public Student findStudentById(int sid) throws SQLException {
// TODO Auto-generated method stub
StudentDao dao = new StudentDaoImpl();
return dao.findStudentById(sid);
}

@Override
public void update(Student student) throws SQLException {
// TODO Auto-generated method stub
StudentDao dao = new StudentDaoImpl();
dao.update(student);
}

@Override
public List<Student> searchStudent(String sname, String sgender) throws SQLException {
// TODO Auto-generated method stub
StudentDao dao = new StudentDaoImpl();
return dao.searchStudent(sname, sgender);
}

}

package com.dashucoding.servlet;

import java.io.IOException;
import java.sql.SQLException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.dashucoding.domain.Student;
import com.dashucoding.service.StudentService;
import com.dashucoding.service.impl.StudentServiceImpl;

/**
 * Servlet implementation class SearchStudentServlet
 */
public class SearchStudentServlet extends HttpServlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
try {
// 取到了要查詢的關鍵資料
String sname = request.getParameter("sname");
String sgender = request.getParameter("sgender");

// 找service查詢
StudentService service = new StudentServiceImpl();
List<Student> list = service.searchStudent(sname, sgender);

/*for(Student student : list) {
System.out.println("stu=" + student);
}*/

request.setAttribute("list", list);
// 跳轉介面
request.getRequestDispatcher("list.jsp").forward(request, response);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}

package com.dashucoding.servlet;

import java.io.IOException;
import java.sql.SQLException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.dashucoding.dao.StudentDao;
import com.dashucoding.dao.impl.StudentDaoImpl;
import com.dashucoding.domain.Student;
import com.dashucoding.service.StudentService;
import com.dashucoding.service.impl.StudentServiceImpl;

public class StudentListServlet extends HttpServlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
// 查詢所有的學生
StudentService service = new StudentServiceImpl();
List<Student> list = service.findAll();
// 把資料儲存到作用域中
request.setAttribute("list", list);

// 跳轉頁面
request.getRequestDispatcher("list.jsp").forward(request,response);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}

}

結言

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感謝你學習今天的內容，如果你覺得這篇文章對你有幫助的話，也歡迎把它分享給更多的朋友，感謝。

結語

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